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Finding the Fourth Proportional to 81,312.60, 121,968.90 and 28,727.40

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Solution

The fourth proportional to 81,312.60, 121,968.90 and 28,727.40 is: 43,091.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,312.60 : 121,968.90 = 28,727.40 : x
  2. Step 2: Convert to fraction form
    81,312.60/121,968.90 = 28,727.40/x
  3. Step 3: Cross multiply
    81,312.60x = 121,968.90 × 28,727.40
  4. Step 4: Simplify right side
    81,312.60x = 3,503,849,377.86
  5. Step 5: Solve for x
    x = 3,503,849,377.86/81,312.60
  6. Step 6: Final answer
    x = 43,091.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.